I'm using HP Pavilion G6 laptop, and I recently installed Ubuntu 12.04, from now whenever I use Ubuntu my system heats up and unexpectedly shutdowns.
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Are you using the proprietary drivers or open source drivers. To enable proprietary drivers: Software Sourcers > Additional Drivers tab > Select a proprietary driver and hit apply changes. See if this resolves your problem. It did in the case of my HP dv7-1285dx Laptop.

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lspci -nn
to your question. See how. – Oli Sep 18 '13 at 14:23